description = [[ 
Uses a multicast query to discover devices supporting the Web Services
Dynamic Discovery (WS-Discovery) protocol. It also attempts to locate
any published Windows Communication Framework (WCF) web services (.NET
4.0 or later).
]]

---
-- @usage
-- sudo ./nmap --script broadcast-wsdd-discover 
--
-- @output
-- | broadcast-wsdd-discover: 
-- |   Devices
-- |     1.2.3.116
-- |         Message id: 9ea97e41-e874-faa7-fe28-deadbeefceb3
-- |         Address: http://1.2.3.116:50000
-- |         Type: Device wprt:PrintDeviceType
-- |     1.2.3.131
-- |         Message id: 4d971368-291c-1218-30f1-deadbeefceb3
-- |         Address: http://1.2.3.131:5357/deadbeef-ea5c-4b9a-a68d-deadbeefceb3/
-- |         Type: Device pub:Computer
-- |     1.2.3.110
-- |         Message id: f5a25a38-d61c-49e5-96c4-deadbeefceb3
-- |         Address: http://1.2.3.110:5357/deadbeef-469b-4da4-b413-deadbeefee90/
-- |         Type: Device pub:Computer
-- |   WCF Services
-- |     1.2.3.131
-- |         Message id: c1767df8-43e5-4440-9e26--deadbeefceb3
-- |_        Address: http://win-7:8090/discovery/scenarios/service2/deadbeef-3382-4668-86e7-deadbeefb935/
--
-- 

--
-- Version 0.1
-- Created 10/31/2010 - v0.1 - created by Patrik Karlsson <patrik@cqure.net>

author = "Patrik Karlsson"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"broadcast", "safe"}

require 'shortport'
require 'wsdd'

prerule = function() return true end

-- function used for running several discovery threads in parallell
--
-- @param funcname string containing the name of the function to run
--        the name should be one of the discovery functions in wsdd.Helper
-- @param result table into which the results are stored
discoverThread = function( funcname, results )
	-- calculates a timeout based on the timing template (default: 5s)
	local timeout = ( 20000 / ( nmap.timing_level() + 1 ) )
	local condvar = nmap.condvar( results )
	local helper = wsdd.Helper:new()
	helper:setMulticast(true)
	helper:setTimeout(timeout)
	
	local func = loadstring( "return helper:" .. funcname .. "()" )
	setfenv(func, setmetatable({ helper=helper; }, {__index = _G}))
	
	if ( func ) then
		local status, result = func()
		if ( status ) then table.insert(results, result) end
	else
		stdnse.print_debug("ERROR: Failed to call function: %s", funcname)
	end
	condvar("broadcast")
end

local function sortfunc(a,b)
	if ( a and b and a.name and b.name ) and ( a.name < b.name ) then
		return true
	end
	return false
end

action = function()

	local threads, results = {}, {}
	local condvar = nmap.condvar( results )
	
	-- Attempt to discover both devices and WCF web services
	for _, f in ipairs( {"discoverDevices", "discoverWCFServices"} ) do
		threads[stdnse.new_thread( discoverThread, f, results )] = true
	end
	
	local done
	-- wait for all threads to finish
	while( not(done) ) do
		condvar("wait")
		done = true
		for thread in pairs(threads) do
			if (coroutine.status(thread) ~= "dead") then done = false end
		end
	end

	if ( results ) then
		table.sort( results, sortfunc )
		return stdnse.format_output(true, results)
	end
end
